| // RUN: %clang_analyze_cc1 %s \ |
| // RUN: -analyzer-checker=core \ |
| // RUN: -analyzer-checker=debug.ExprInspection \ |
| // RUN: -verify |
| |
| void clang_analyzer_warnIfReached(); |
| void clang_analyzer_eval(int); |
| |
| void rem_constant_rhs_ne_zero(int x, int y) { |
| if (x % 3 == 0) // x % 3 != 0 -> x != 0 |
| return; |
| if (x * y != 0) // x * y == 0 |
| return; |
| if (y != 1) // y == 1 -> x == 0 |
| return; |
| clang_analyzer_warnIfReached(); // no-warning |
| (void)x; // keep the constraints alive. |
| } |
| |
| void rem_symbolic_rhs_ne_zero(int x, int y, int z) { |
| if (x % z == 0) // x % z != 0 -> x != 0 |
| return; |
| if (x * y != 0) // x * y == 0 |
| return; |
| if (y != 1) // y == 1 -> x == 0 |
| return; |
| clang_analyzer_warnIfReached(); // no-warning |
| (void)x; // keep the constraints alive. |
| } |
| |
| void rem_symbolic_rhs_ne_zero_nested(int w, int x, int y, int z) { |
| if (w % x % z == 0) // w % x % z != 0 -> w % x != 0 |
| return; |
| if (w % x * y != 0) // w % x * y == 0 |
| return; |
| if (y != 1) // y == 1 -> w % x == 0 |
| return; |
| clang_analyzer_warnIfReached(); // no-warning |
| (void)(w * x); // keep the constraints alive. |
| } |
| |
| void rem_constant_rhs_ne_zero_early_contradiction(int x, int y) { |
| if ((x + y) != 0) // (x + y) == 0 |
| return; |
| if ((x + y) % 3 == 0) // (x + y) % 3 != 0 -> (x + y) != 0 -> contradiction |
| return; |
| clang_analyzer_warnIfReached(); // no-warning |
| (void)x; // keep the constraints alive. |
| } |
| |
| void rem_symbolic_rhs_ne_zero_early_contradiction(int x, int y, int z) { |
| if ((x + y) != 0) // (x + y) == 0 |
| return; |
| if ((x + y) % z == 0) // (x + y) % z != 0 -> (x + y) != 0 -> contradiction |
| return; |
| clang_analyzer_warnIfReached(); // no-warning |
| (void)x; // keep the constraints alive. |
| } |
| |
| void internal_unsigned_signed_mismatch(unsigned a) { |
| int d = a; |
| // Implicit casts are not handled, thus the analyzer models `d % 2` as |
| // `(reg_$0<unsigned int a>) % 2` |
| // However, this should not result in internal signedness mismatch error when |
| // we assign new constraints below. |
| if (d % 2 != 0) |
| return; |
| } |
| |
| void remainder_with_adjustment(int x) { |
| if ((x + 1) % 3 == 0) // (x + 1) % 3 != 0 -> x + 1 != 0 -> x != -1 |
| return; |
| clang_analyzer_eval(x + 1 != 0); // expected-warning{{TRUE}} |
| clang_analyzer_eval(x != -1); // expected-warning{{TRUE}} |
| (void)x; // keep the constraints alive. |
| } |
| |
| void remainder_with_adjustment_of_composit_lhs(int x, int y) { |
| if ((x + y + 1) % 3 == 0) // (x + 1) % 3 != 0 -> x + 1 != 0 -> x != -1 |
| return; |
| clang_analyzer_eval(x + y + 1 != 0); // expected-warning{{TRUE}} |
| clang_analyzer_eval(x + y != -1); // expected-warning{{TRUE}} |
| (void)(x * y); // keep the constraints alive. |
| } |